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GPU is not detected by pc


After a new build and taking out my gpu and hard drives from my old working pc and put it into my new parts (motherboard,ram,cpu.) I find that there is power to the card ( the fans spin) however no display, is this because windows isn’t downloading the correct (or any)  drivers? As I go onto my onboard graphics I get a display and look into device manager to only see intel graphics and no Nvidia cars drivers, if I try to download these drivers nvidia will not let me as it can’t detect any nvidia hardware. 
Please note:
- i have tested my gpu and cpu + ram on another motherboard to find the same problem.
- I have tested my gpu in another working pc to find it working.
- i have tried another 600w psu.
- I have made sure the six pin connector is connected into the gpu. 
- I have reseated the card several times.
- if I try the gpu display I do not get any display at all ( I can’t get to see the screen to go to the BIOS)
-I have been on the BIOS using onboard graphics to find the primary display is on ‘auto’ and attempted to change this to ‘PCI-E’ however when I save and exit I find the changes just revert back to auto.
- the bios detects the RAM.
- I have tried a different monitor and different port (hdmi and DisplayPort).
- my bios version is 0.0810 ( is this the latest? For my Asus b250m-a motherboard.
Cpu: I7 7700k 4.20ghz
gpu: asus Gtx 1060 3gb
Motherboard: ASUS prime b250m-a
Ram: Corsair vengeance 2x4gb 3000mhz ( running at 2133mhz)
Psu: Corsair 450w
2x hard drive.

Thanks for reading and hope you can help, I have really run out of ideas and am really confused as to why it’s not working. Thanks in advance, Sam.

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Use display driver uninstaller to uninstall all your current drivers, then reinstall the lastest one from NVIDIA’s website. 

My Build, v2.1 --- CPU: i7-8700K @ 5.2GHz/1.288v || MoBo: Asus ROG STRIX Z390-E Gaming || RAM: 4x4GB G.SKILL Ripjaws 4 2666 14-14-14-33 || Cooler: Custom Loop || GPU: EVGA GTX 1080 Ti SC Black, on water || PSU: EVGA G2 850W || Case: Corsair 450D || SSD: 850 Evo 250GB, Intel 660p 2TB || Storage: WD Blue 2TB || G502 & Glorious PCGR Fully Custom 80% Keyboard || MX34VQ, PG278Q, PB278Q

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My Car --- 2006 Mustang GT || 5-speed || BBK LTs, O/R X, MBRP Cat-back || BBK Lowering Springs, LCAs || 2007 GT500 wheels w/ 245s/285s


The Experiment --- CPU: i5-3570K @ 4.0 GHz || MoBo: Asus P8Z77-V LK || RAM: 16GB Corsair 1600 4x4 || Cooler: CM Hyper 212 Evo || GPUs: Asus GTX 750 Ti, || PSU: Corsair TX750M Gold || Case: Thermaltake Core G21 TG || SSD: 840 Pro 128GB || HDD: Seagate Barracuda 2TB


R.I.P. Asus X99-A motherboard, April 2016 - October 2018, may you rest in peace. 5820K, if I ever buy you a new board, it'll be a good one.

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